| Abstract
| - The time-resolved infrared fluorescence (IRF) technique has beenused to study the vibrational deactivationof CO2(0001) andN2O(0001) byC6D5CH3 andC6H5CD3 at ambient temperature(295 ± 2 K). The bimoleculardeactivation rate constants were found to be (242 ± 17) ×103 and (145 ± 5) × 103Torr-1 s-1,respectively,for the deactivation of CO2(0001), and(253 ± 13) × 103 and (376 ± 20) × 103Torr-1 s-1,respectively, forthe deactivation of N2O(0001).Experimental deactivation probabilities are calculated andcompared withour previous data for deactivation of the same two excited molecules bythe colliders C6H6,C6D6,C6H5CH3,and C6D5CD3. Alldeuterated species show enhanced deactivation relative to therespective nondeuteratedspecies, with the largest effects being exhibited by the deactivationof N2O(0001) byC6D5CD3 andC6H5CD3.The results indicate that the C−D stretch mode in the methylgroup of the toluene isotopomers is the majorfactor responsible for the considerably enhanced deactivation ofN2O(0001), probably as a result ofnear-resonant intermolecular V−V energy transfer.
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